Geant4 Cross Reference

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Geant4/processes/hadronic/models/de_excitation/gem_evaporation/src/G4GEMCoulombBarrier.cc

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 25 //
 26 // J. M. Quesada (July 2009):  New class based on G4GEMCoulombBarrierHE
 27 // Coded strictly according to Furihata's GEM paper 
 28 // NEW:effective decrease  of barrier with E* (Barashenkov) has been added
 29 //
 30 #include "G4GEMCoulombBarrier.hh"
 31 #include "G4HadronicException.hh"
 32 #include "G4Pow.hh"
 33 #include "G4PhysicalConstants.hh"
 34 #include "G4SystemOfUnits.hh"
 35 
 36 G4GEMCoulombBarrier::G4GEMCoulombBarrier(G4int anA, G4int aZ) :
 37   G4CoulombBarrier(anA, aZ) 
 38 {
 39   g4calc = G4Pow::GetInstance();
 40   AejectOneThird = g4calc->Z13(anA);
 41 }
 42 
 43 G4double G4GEMCoulombBarrier::GetCoulombBarrier(G4int ARes, G4int ZRes, 
 44                                                 G4double U) const 
 45 {
 46   // Calculation of Coulomb potential energy (barrier) for outgoing fragment
 47   G4double Barrier = 0.0;
 48   if (theZ > 0) {
 49 
 50     G4double CompoundRadius = CalcCompoundRadius(ARes);
 51     Barrier = CLHEP::elm_coupling * (theZ * ZRes)/CompoundRadius;
 52       
 53     // Barrier penetration coeficient
 54     if(theA <= 4) { Barrier *= BarrierPenetrationFactor(ZRes); }
 55   
 56     //JMQ 200709 effective decrease  of barrier with E* (Barashenkov)
 57     // (not inclued in original Furihata's formulation)
 58     Barrier /= (1.0 + std::sqrt(U/((2*ARes)*CLHEP::MeV)));
 59   }
 60   return Barrier;
 61 }
 62 
 63 G4double G4GEMCoulombBarrier::CalcCompoundRadius(G4int ARes) const
 64 {      
 65   G4double AresOneThird = g4calc->Z13(ARes);
 66 
 67   G4double Result = 0.0;
 68   if(theA == 1){
 69     Result = 1.7* AresOneThird;
 70 
 71   } else if (theA <= 4){
 72     Result = 1.7* AresOneThird + 1.2;
 73 
 74   } else {
 75     Result = 1.12*(AresOneThird + AejectOneThird) - 
 76       0.86*(AresOneThird+AejectOneThird)/(AresOneThird*AejectOneThird)+3.75;
 77   }
 78   return Result*CLHEP::fermi;
 79 }
 80 
 81 
 82